<template>
	<view class="u-wrap">
		<view class="u-search-box">
			<u-search :placeholder="placeholder" v-model="keyword" :show-action="false" input-align="center" @search="searchKeyWord()" @clear="clearabled()"></u-search>
		</view>
		<view class="u-menu-wrap">
			<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop" show-scrollbar="false">
				<view v-for="(item,index) in tabbar" :key="item.id" class="u-tab-item" :class="[current==index ? 'u-tab-item-active' : '']"
				 :data-current="index" @tap.stop="swichMenu(index)">
					<text class="u-line-1">{{item.name}}</text>
				</view>
			</scroll-view>
			<block v-for="(item,index) in tabbar" :key="item.index">
				<scroll-view scroll-y class="right-box" v-if="current==index" @scrolltolower="scollEvent()">
					<view class="page-view">
						<view class="class-item u-skeleton">
							<view class="item-title">
								<text>{{item.name}}</text>
							</view>
							<!-- 导入商品列表组件 -->
							<book-list :bookList="bookLists"></book-list>
						</view>
					</view>
				</scroll-view>
				<u-skeleton :loading="show" :animation="true"></u-skeleton>
			</block>
		</view>
		
	</view>
</template>

<script>
	import bookList from '../../commponts/bookList.vue'
	export default {
		components:{
			bookList
		},
		data() {
			return {
				tabbar: [],
				bookLists:[],
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
				// 分页
				page:1,
				//骨架屏
				show:false,
				isLastPage:false,
				keyword:'',
				placeholder:'前端'
			}
		},
		computed: {
			
		},
		onLoad() {
			this.getdata()
		},
		methods: {
			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if(index == this.current) return ;
				this.current = index;
				// 如果为0，意味着尚未初始化
				console.log(index)
				// 将菜单菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
				// 根据用户点击的选项卡附带的index请求数据
				this.page=1;
				this.bookLists=[]
				this.getdata()
			},
			
			// 封装请求图书系列的函数
			async getdata(){
				this.show=true
				// 请求参数
				const params={
					page:this.page,
					
				}
				// if(this.isLastPage)
				
				if(this.current) params.category_id=this.current;
				if(this.keyword) params.title=this.keyword
				await this.$u.get('/api/goods',params).then(res=>{
					this.show=false
					this.isLastPage=res.data.goods.next_page_url ? false : true;
					// 左侧标题
					this.tabbar=res.data.categories;
					// this.bookLists=res.data.goods.data;
					this.bookLists=[...this.bookLists,...res.data.goods.data];
					// 右侧对应的商品信息
				})
				.catch(err=>{
					console.log(err)
				})
			},
			// 触底事件
			scollEvent(){
				if(this.isLastPage){
					// console.log(1111)
				}else{
					this.page=this.page+1;
					// console.log(this.page)
					this.getdata();
				}	
			},
			// 搜索框搜索内容
		    async searchKeyWord(){
				const params={
					title:this.keyword
				}
				await this.$u.get('/api/goods',params).then(res=>{
					console.log(res)
					this.page=1;
					this.bookLists=[];
					this.bookLists=res.data.goods.data
				}).catch(err=>{
					console.log(err)
				})
			},
			// 清空搜索框内容触发事件
			clearabled(){
				this.getdata();
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-search-box {
		padding: 18rpx 30rpx;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-search-inner {
		background-color: rgb(234, 234, 234);
		border-radius: 100rpx;
		display: flex;
		align-items: center;
		padding: 10rpx 16rpx;
	}

	.u-search-text {
		font-size: 26rpx;
		color: $u-tips-color;
		margin-left: 10rpx;
	}

	.u-tab-view {
		width: 100px;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}
	
	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}
	
	.u-tab-item-active::before {
		content: "";
		position: absolute;
		border-left: 4px solid $u-type-primary;
		height: 32rpx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}
	
	.right-box {
		background-color: rgb(250, 250, 250);
	}
	
	.page-view {
		padding: 16rpx;
	}
	
	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}
	
	.item-title {
		font-size: 26rpx;
		color: $u-main-color;
		font-weight: bold;
		padding-bottom: 20px;
	}
	
	.item-menu-name {
		font-weight: normal;
		font-size: 24rpx;
		color: $u-main-color;
	}
	
	.item-container {
		display: flex;
		flex-wrap: wrap;
	}
	
	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}
	
	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}
</style>
